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Fix problems with window sizing seen by Raghavendra D Prabhu when
starting tmux from .xinitrc.

One of the very few things the server relies on the client for now is to
pass through a message on SIGWINCH, but there is a condition where
potentially a SIGWINCH may be lost during the transition from unattached
(main.c) to attached (client.c). So trigger a size change immediately
after the client installs its SIGWINCH handler.

Also, when the terminal is resized, reset the scroll region and cursor
position. Previously, we were clearing our saved idea of these, but in
fact some terminals do not reset them on resize, so this caused problems
during redraw.

While here make a resize to the same size not cause a redraw and rename
the tmux.out output log file to include the tmux PID.

/* $OpenBSD: tmux.h,v 1.224 2010/06/05 16:47:11 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef TMUX_H
#define TMUX_H

#define PROTOCOL_VERSION 5

#include <sys/param.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/uio.h>

#include <bitstring.h>
#include <event.h>
#include <getopt.h>
#include <imsg.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <termios.h>

#include "array.h"

extern char    *__progname;
extern char   **environ;

/* Default configuration files. */
#define DEFAULT_CFG ".tmux.conf"
#define SYSTEM_CFG "/etc/tmux.conf"

/* Default prompt history length. */
#define PROMPT_HISTORY 100

/*
 * Minimum layout cell size, NOT including separator line. The scroll region
 * cannot be one line in height so this must be at least two.
 */
#define PANE_MINIMUM 2

/* Automatic name refresh interval, in milliseconds. */
#define NAME_INTERVAL 500

/* Maximum data to buffer for output before suspending reading from panes. */
#define BACKOFF_THRESHOLD 1024

/*
 * Maximum sizes of strings in message data. Don't forget to bump
 * PROTOCOL_VERSION if any of these change!
 */
#define COMMAND_LENGTH 2048	/* packed argv size */
#define TERMINAL_LENGTH 128	/* length of TERM environment variable */
#define PRINT_LENGTH 512	/* printed error/message size */
#define ENVIRON_LENGTH 1024	/* environment variable length */

/*
 * UTF-8 data size. This must be big enough to hold combined characters as well
 * as single.
 */
#define UTF8_SIZE 9

/* Fatal errors. */
#define fatal(msg) log_fatal("%s: %s", __func__, msg);
#define fatalx(msg) log_fatalx("%s: %s", __func__, msg);

/* Definition to shut gcc up about unused arguments. */
#define unused __attribute__ ((unused))

/* Attribute to make gcc check printf-like arguments. */
#define printflike1 __attribute__ ((format (printf, 1, 2)))
#define printflike2 __attribute__ ((format (printf, 2, 3)))
#define printflike3 __attribute__ ((format (printf, 3, 4)))
#define printflike4 __attribute__ ((format (printf, 4, 5)))
#define printflike5 __attribute__ ((format (printf, 5, 6)))

/* Number of items in array. */
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif

/* Bell option values. */
#define BELL_NONE 0
#define BELL_ANY 1
#define BELL_CURRENT 2

/* Special key codes. */
#define KEYC_NONE 0xfff
#define KEYC_BASE 0x1000

/* Key modifier bits. */
#define KEYC_ESCAPE 0x2000
#define KEYC_CTRL 0x4000
#define KEYC_SHIFT 0x8000
#define KEYC_PREFIX 0x10000

/* Other key codes. */
enum key_code {
	/* Mouse key. */
	KEYC_MOUSE = KEYC_BASE,

	/* Backspace key. */
	KEYC_BSPACE,

	/* Function keys. */
	KEYC_F1,
	KEYC_F2,
	KEYC_F3,
	KEYC_F4,
	KEYC_F5,
	KEYC_F6,
	KEYC_F7,
	KEYC_F8,
	KEYC_F9,
	KEYC_F10,
	KEYC_F11,
	KEYC_F12,
	KEYC_F13,
	KEYC_F14,
	KEYC_F15,
	KEYC_F16,
	KEYC_F17,
	KEYC_F18,
	KEYC_F19,
	KEYC_F20,
	KEYC_IC,
	KEYC_DC,
	KEYC_HOME,
	KEYC_END,
	KEYC_NPAGE,
	KEYC_PPAGE,
	KEYC_BTAB,

	/* Arrow keys. */
	KEYC_UP,
	KEYC_DOWN,
	KEYC_LEFT,
	KEYC_RIGHT,

	/* Numeric keypad. */
	KEYC_KP_SLASH,
	KEYC_KP_STAR,
	KEYC_KP_MINUS,
	KEYC_KP_SEVEN,
	KEYC_KP_EIGHT,
	KEYC_KP_NINE,
	KEYC_KP_PLUS,
	KEYC_KP_FOUR,
	KEYC_KP_FIVE,
	KEYC_KP_SIX,
	KEYC_KP_ONE,
	KEYC_KP_TWO,
	KEYC_KP_THREE,
	KEYC_KP_ENTER,
	KEYC_KP_ZERO,
	KEYC_KP_PERIOD,
};

/* Termcap codes. */
enum tty_code_code {
	TTYC_AX = 0,
	TTYC_ACSC,	/* acs_chars, ac */
	TTYC_BEL,	/* bell, bl */
	TTYC_BLINK,	/* enter_blink_mode, mb */
	TTYC_BOLD,	/* enter_bold_mode, md */
	TTYC_CIVIS,	/* cursor_invisible, vi */
	TTYC_CLEAR,	/* clear_screen, cl */
	TTYC_CNORM,	/* cursor_normal, ve */
	TTYC_COLORS,	/* max_colors, Co */
	TTYC_CSR,	/* change_scroll_region, cs */
	TTYC_CUB,	/* parm_left_cursor, LE */
	TTYC_CUB1,	/* cursor_left, le */
	TTYC_CUD,	/* parm_down_cursor, DO */
	TTYC_CUD1,	/* cursor_down, do */
	TTYC_CUF,	/* parm_right_cursor, RI */
	TTYC_CUF1,	/* cursor_right, nd */
	TTYC_CUP,	/* cursor_address, cm */
	TTYC_CUU,	/* parm_up_cursor, UP */
	TTYC_CUU1,	/* cursor_up, up */
	TTYC_DCH,	/* parm_dch, DC */
	TTYC_DCH1,	/* delete_character, dc */
	TTYC_DIM,	/* enter_dim_mode, mh */
	TTYC_DL,	/* parm_delete_line, DL */
	TTYC_DL1,	/* delete_line, dl */
	TTYC_EL,	/* clr_eol, ce */
	TTYC_EL1,	/* clr_bol, cb */
	TTYC_ENACS,	/* ena_acs, eA */
	TTYC_HOME,	/* cursor_home, ho */
	TTYC_HPA,	/* column_address, ch */
	TTYC_ICH,	/* parm_ich, IC */
	TTYC_ICH1,	/* insert_character, ic */
	TTYC_IL,	/* parm_insert_line, IL */
	TTYC_IL1,	/* insert_line, il */
	TTYC_INVIS,	/* enter_secure_mode, mk */
	TTYC_IS1,	/* init_1string, i1 */
	TTYC_IS2,	/* init_2string, i2 */
	TTYC_IS3,	/* init_3string, i3 */
	TTYC_KCBT,	/* key_btab, kB */
	TTYC_KCUB1,	/* key_left, kl */
	TTYC_KCUD1,	/* key_down, kd */
	TTYC_KCUF1,	/* key_right, kr */
	TTYC_KCUU1,	/* key_up, ku */
	TTYC_KDC2,
	TTYC_KDC3,
	TTYC_KDC4,
	TTYC_KDC5,
	TTYC_KDC6,
	TTYC_KDC7,
	TTYC_KDCH1,	/* key_dc, kD */
	TTYC_KDN2,
	TTYC_KDN3,
	TTYC_KDN4,
	TTYC_KDN5,
	TTYC_KDN6,
	TTYC_KDN7,
	TTYC_KEND,	/* key_end, ke */
	TTYC_KEND2,
	TTYC_KEND3,
	TTYC_KEND4,
	TTYC_KEND5,
	TTYC_KEND6,
	TTYC_KEND7,
	TTYC_KF1,	/* key_f1, k1 */
	TTYC_KF10,	/* key_f10, k; */
	TTYC_KF11,	/* key_f11, F1 */
	TTYC_KF12,	/* key_f12, F2 */
	TTYC_KF13,	/* key_f13, F3 */
	TTYC_KF14,	/* key_f14, F4 */
	TTYC_KF15,	/* key_f15, F5 */
	TTYC_KF16,	/* key_f16, F6 */
	TTYC_KF17,	/* key_f17, F7 */
	TTYC_KF18,	/* key_f18, F8 */
	TTYC_KF19,	/* key_f19, F9 */
	TTYC_KF2,	/* key_f2, k2 */
	TTYC_KF20,	/* key_f20, F10 */
	TTYC_KF3,	/* key_f3, k3 */
	TTYC_KF4,	/* key_f4, k4 */
	TTYC_KF5,	/* key_f5, k5 */
	TTYC_KF6,	/* key_f6, k6 */
	TTYC_KF7,	/* key_f7, k7 */
	TTYC_KF8,	/* key_f8, k8 */
	TTYC_KF9,	/* key_f9, k9 */
	TTYC_KHOM2,
	TTYC_KHOM3,
	TTYC_KHOM4,
	TTYC_KHOM5,
	TTYC_KHOM6,
	TTYC_KHOM7,
	TTYC_KHOME,	/* key_home, kh */
	TTYC_KIC2,
	TTYC_KIC3,
	TTYC_KIC4,
	TTYC_KIC5,
	TTYC_KIC6,
	TTYC_KIC7,
	TTYC_KICH1,	/* key_ic, kI */
	TTYC_KLFT2,
	TTYC_KLFT3,
	TTYC_KLFT4,
	TTYC_KLFT5,
	TTYC_KLFT6,
	TTYC_KLFT7,
	TTYC_KMOUS,	/* key_mouse, Km */
	TTYC_KNP,	/* key_npage, kN */
	TTYC_KNXT2,
	TTYC_KNXT3,
	TTYC_KNXT4,
	TTYC_KNXT5,
	TTYC_KNXT6,
	TTYC_KNXT7,
	TTYC_KPP,	/* key_ppage, kP */
	TTYC_KPRV2,
	TTYC_KPRV3,
	TTYC_KPRV4,
	TTYC_KPRV5,
	TTYC_KPRV6,
	TTYC_KPRV7,
	TTYC_KRIT2,
	TTYC_KRIT3,
	TTYC_KRIT4,
	TTYC_KRIT5,
	TTYC_KRIT6,
	TTYC_KRIT7,
	TTYC_KUP2,
	TTYC_KUP3,
	TTYC_KUP4,
	TTYC_KUP5,
	TTYC_KUP6,
	TTYC_KUP7,
	TTYC_OP,	/* orig_pair, op */
	TTYC_REV,	/* enter_reverse_mode, mr */
	TTYC_RI,	/* scroll_reverse, sr */
	TTYC_RMACS,	/* exit_alt_charset_mode */
	TTYC_RMCUP,	/* exit_ca_mode, te */
	TTYC_RMIR,	/* exit_insert_mode, ei */
	TTYC_RMKX,	/* keypad_local, ke */
	TTYC_SETAB,	/* set_a_background, AB */
	TTYC_SETAF,	/* set_a_foreground, AF */
	TTYC_SGR0,	/* exit_attribute_mode, me */
	TTYC_SMACS,	/* enter_alt_charset_mode, as */
	TTYC_SMCUP,	/* enter_ca_mode, ti */
	TTYC_SMIR,	/* enter_insert_mode, im */
	TTYC_SMKX,	/* keypad_xmit, ks */
	TTYC_SMSO,	/* enter_standout_mode, so */
	TTYC_SMUL,	/* enter_underline_mode, us */
	TTYC_VPA,	/* row_address, cv */
	TTYC_XENL,	/* eat_newline_glitch, xn */
};
#define NTTYCODE (TTYC_XENL + 1)

/* Termcap types. */
enum tty_code_type {
	TTYCODE_NONE = 0,
	TTYCODE_STRING,
	TTYCODE_NUMBER,
	TTYCODE_FLAG,
};

/* Termcap code. */
struct tty_code {
	enum tty_code_type	type;
	union {
		char	       *string;
		int		number;
		int		flag;
	} value;
};

/* Entry in terminal code table. */
struct tty_term_code_entry {
	enum tty_code_code	code;
	enum tty_code_type	type;
	const char	       *name;
};

/* Message codes. */
enum msgtype {
	MSG_COMMAND,
	MSG_DETACH,
	MSG_ERROR,
	MSG_EXIT,
	MSG_EXITED,
	MSG_EXITING,
	MSG_IDENTIFY,
	MSG_PRINT,
	MSG_READY,
	MSG_RESIZE,
	MSG_SHUTDOWN,
	MSG_SUSPEND,
	MSG_VERSION,
	MSG_WAKEUP,
	MSG_ENVIRON,
	MSG_UNLOCK,
	MSG_LOCK,
	MSG_SHELL
};

/*
 * Message data.
 *
 * Don't forget to bump PROTOCOL_VERSION if any of these change!
 */
struct msg_print_data {
	char		msg[PRINT_LENGTH];
};

struct msg_command_data {
	pid_t		pid;			/* pid from $TMUX or -1 */
	u_int		idx;			/* index from $TMUX */

	int		argc;
	char		argv[COMMAND_LENGTH];
};

struct msg_identify_data {
	char		cwd[MAXPATHLEN];

	char		term[TERMINAL_LENGTH];

#define IDENTIFY_UTF8 0x1
#define IDENTIFY_256COLOURS 0x2
#define IDENTIFY_88COLOURS 0x4
	int		flags;
};

struct msg_lock_data {
	char		cmd[COMMAND_LENGTH];
};

struct msg_environ_data {
	char		var[ENVIRON_LENGTH];
};

struct msg_shell_data {
	char		shell[MAXPATHLEN];
};

/* Mode key commands. */
enum mode_key_cmd {
	MODEKEY_NONE,
	MODEKEY_OTHER,

	/* Editing keys. */
	MODEKEYEDIT_BACKSPACE,
	MODEKEYEDIT_CANCEL,
	MODEKEYEDIT_COMPLETE,
	MODEKEYEDIT_CURSORLEFT,
	MODEKEYEDIT_CURSORRIGHT,
	MODEKEYEDIT_DELETE,
	MODEKEYEDIT_DELETELINE,
	MODEKEYEDIT_DELETETOENDOFLINE,
	MODEKEYEDIT_ENDOFLINE,
	MODEKEYEDIT_ENTER,
	MODEKEYEDIT_HISTORYDOWN,
	MODEKEYEDIT_HISTORYUP,
	MODEKEYEDIT_PASTE,
	MODEKEYEDIT_STARTOFLINE,
	MODEKEYEDIT_SWITCHMODE,
	MODEKEYEDIT_SWITCHMODEAPPEND,
	MODEKEYEDIT_TRANSPOSECHARS,

	/* Menu (choice) keys. */
	MODEKEYCHOICE_CANCEL,
	MODEKEYCHOICE_CHOOSE,
	MODEKEYCHOICE_DOWN,
	MODEKEYCHOICE_PAGEDOWN,
	MODEKEYCHOICE_PAGEUP,
	MODEKEYCHOICE_SCROLLDOWN,
	MODEKEYCHOICE_SCROLLUP,
	MODEKEYCHOICE_UP,

	/* Copy keys. */
	MODEKEYCOPY_BACKTOINDENTATION,
	MODEKEYCOPY_BOTTOMLINE,
	MODEKEYCOPY_CANCEL,
	MODEKEYCOPY_CLEARSELECTION,
	MODEKEYCOPY_COPYSELECTION,
	MODEKEYCOPY_DOWN,
	MODEKEYCOPY_ENDOFLINE,
	MODEKEYCOPY_GOTOLINE,
	MODEKEYCOPY_HALFPAGEDOWN,
	MODEKEYCOPY_HALFPAGEUP,
	MODEKEYCOPY_HISTORYBOTTOM,
	MODEKEYCOPY_HISTORYTOP,
	MODEKEYCOPY_JUMP,
	MODEKEYCOPY_JUMPAGAIN,
	MODEKEYCOPY_JUMPREVERSE,
	MODEKEYCOPY_JUMPBACK,
	MODEKEYCOPY_LEFT,
	MODEKEYCOPY_MIDDLELINE,
	MODEKEYCOPY_NEXTPAGE,
	MODEKEYCOPY_NEXTSPACE,
	MODEKEYCOPY_NEXTSPACEEND,
	MODEKEYCOPY_NEXTWORD,
	MODEKEYCOPY_NEXTWORDEND,
	MODEKEYCOPY_PREVIOUSPAGE,
	MODEKEYCOPY_PREVIOUSSPACE,
	MODEKEYCOPY_PREVIOUSWORD,
	MODEKEYCOPY_RECTANGLETOGGLE,
	MODEKEYCOPY_RIGHT,
	MODEKEYCOPY_SCROLLDOWN,
	MODEKEYCOPY_SCROLLUP,
	MODEKEYCOPY_SEARCHAGAIN,
	MODEKEYCOPY_SEARCHDOWN,
	MODEKEYCOPY_SEARCHREVERSE,
	MODEKEYCOPY_SEARCHUP,
	MODEKEYCOPY_STARTNUMBERPREFIX,
	MODEKEYCOPY_STARTOFLINE,
	MODEKEYCOPY_STARTSELECTION,
	MODEKEYCOPY_TOPLINE,
	MODEKEYCOPY_UP,
};

/* Entry in the default mode key tables. */
struct mode_key_entry {
	int			key;

	/*
	 * Editing mode for vi: 0 is edit mode, keys not in the table are
	 * returned as MODEKEY_OTHER; 1 is command mode, keys not in the table
	 * are returned as MODEKEY_NONE. This is also matched on, allowing some
	 * keys to be bound in edit mode.
	 */
	int			mode;
	enum mode_key_cmd	cmd;
};

/* Data required while mode keys are in use. */
struct mode_key_data {
	struct mode_key_tree   *tree;
	int			mode;
};
#define MODEKEY_EMACS 0
#define MODEKEY_VI 1

/* Binding between a key and a command. */
struct mode_key_binding {
	int			key;

	int			mode;
	enum mode_key_cmd	cmd;

	SPLAY_ENTRY(mode_key_binding) entry;
};
SPLAY_HEAD(mode_key_tree, mode_key_binding);

/* Command to string mapping. */
struct mode_key_cmdstr {
	enum mode_key_cmd	 cmd;
	const char		*name;
};

/* Named mode key table description. */
struct mode_key_table {
	const char		*name;
	struct mode_key_cmdstr	*cmdstr;
	struct mode_key_tree	*tree;
	const struct mode_key_entry *table;	/* default entries */
};

/* Modes. */
#define MODE_CURSOR 0x1
#define MODE_INSERT 0x2
#define MODE_KCURSOR 0x4
#define MODE_KKEYPAD 0x8	/* set = application, clear = number */
#define MODE_MOUSE 0x10
#define MODE_MOUSEMOTION 0x20
#define MODE_WRAP 0x40		/* whether lines wrap */

/*
 * A single UTF-8 character.
 *
 * The data member in this must be UTF8_SIZE to allow screen_write_copy to
 * reinject stored UTF-8 data back into screen_write_cell after combining (ugh
 * XXX XXX).
 */
struct utf8_data {
	u_char	data[UTF8_SIZE];

	size_t	have;
	size_t	size;

	u_int	width;
};

/* Grid output. */
#if defined(DEBUG) && \
    ((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
     (defined(__GNUC__) && __GNUC__ >= 3))
#define GRID_DEBUG(gd, fmt, ...) log_debug2("%s: (sx=%u, sy=%u, hsize=%u) " \
    fmt, __func__, (gd)->sx, (gd)->sy, (gd)->hsize, ## __VA_ARGS__)
#else
#define GRID_DEBUG(...)
#endif

/* Grid attributes. */
#define GRID_ATTR_BRIGHT 0x1
#define GRID_ATTR_DIM 0x2
#define GRID_ATTR_UNDERSCORE 0x4
#define GRID_ATTR_BLINK 0x8
#define GRID_ATTR_REVERSE 0x10
#define GRID_ATTR_HIDDEN 0x20
#define GRID_ATTR_ITALICS 0x40
#define GRID_ATTR_CHARSET 0x80	/* alternative character set */

/* Grid flags. */
#define GRID_FLAG_FG256 0x1
#define GRID_FLAG_BG256 0x2
#define GRID_FLAG_PADDING 0x4
#define GRID_FLAG_UTF8 0x8

/* Grid line flags. */
#define GRID_LINE_WRAPPED 0x1

/* Grid cell data. */
struct grid_cell {
	u_char	attr;
	u_char	flags;
	u_char	fg;
	u_char	bg;
	u_char	data;
} __packed;

/* Grid cell UTF-8 data. Used instead of data in grid_cell for UTF-8 cells. */
struct grid_utf8 {
	u_char	width;
	u_char	data[UTF8_SIZE];
} __packed;

/* Grid line. */
struct grid_line {
	u_int	cellsize;
	struct grid_cell *celldata;

	u_int	utf8size;
	struct grid_utf8 *utf8data;

	int	flags;
} __packed;

/* Entire grid of cells. */
struct grid {
	int	flags;
#define GRID_HISTORY 0x1	/* scroll lines into history */

	u_int	sx;
	u_int	sy;

	u_int	hsize;
	u_int	hlimit;

	struct grid_line *linedata;
};

/* Option data structures. */
struct options_entry {
	char		*name;

	enum {
		OPTIONS_STRING,
		OPTIONS_NUMBER,
		OPTIONS_DATA,
	} type;

	char		*str;
	long long	 num;
	void		*data;

	void		 (*freefn)(void *);

	SPLAY_ENTRY(options_entry) entry;
};

struct options {
	SPLAY_HEAD(options_tree, options_entry) tree;
	struct options	*parent;
};

/* Key list for prefix option. */
ARRAY_DECL(keylist, int);

/* Scheduled job. */
struct job {
	char		*cmd;
	pid_t		 pid;
	int		 status;

	struct client	*client;

	int		 fd;
	struct bufferevent *event;

	void		(*callbackfn)(struct job *);
	void		(*freefn)(void *);
	void		*data;

	int		 flags;
#define JOB_PERSIST 0x1	/* don't free after callback */

	RB_ENTRY(job)	 entry;
	SLIST_ENTRY(job) lentry;
};
RB_HEAD(jobs, job);
SLIST_HEAD(joblist, job);

/* Screen selection. */
struct screen_sel {
	int		 flag;
	int		 rectflag;

	u_int		 sx;
	u_int		 sy;

	u_int		 ex;
	u_int		 ey;

	struct grid_cell cell;
};

/* Virtual screen. */
struct screen {
	char		*title;

	struct grid	*grid;		/* grid data */

	u_int		 cx;		/* cursor x */
	u_int		 cy;		/* cursor y */

	u_int		 rupper;	/* scroll region top */
	u_int		 rlower;	/* scroll region bottom */

	int		 mode;

	bitstr_t	*tabs;

	struct screen_sel sel;
};

/* Screen write context. */
struct screen_write_ctx {
	struct window_pane *wp;
	struct screen	*s;
};

/* Screen size. */
#define screen_size_x(s) ((s)->grid->sx)
#define screen_size_y(s) ((s)->grid->sy)
#define screen_hsize(s) ((s)->grid->hsize)
#define screen_hlimit(s) ((s)->grid->hlimit)

/* Input parser context. */
struct input_ctx {
	struct window_pane     *wp;
	struct screen_write_ctx ctx;

	struct grid_cell	cell;

	struct grid_cell	old_cell;
	u_int 			old_cx;
	u_int			old_cy;

	u_char			interm_buf[4];
	size_t			interm_len;

	u_char			param_buf[64];
	size_t			param_len;

	u_char			input_buf[256];
	size_t			input_len;

	int			param_list[24];	/* -1 not present */
	u_int			param_list_len;

	struct utf8_data	utf8data;

	int			ch;
	int			flags;
#define INPUT_DISCARD 0x1

	const struct input_state *state;
};

/*
 * Window mode. Windows can be in several modes and this is used to call the
 * right function to handle input and output.
 */
struct session;
struct window;
struct mouse_event;
struct window_mode {
	struct screen *(*init)(struct window_pane *);
	void	(*free)(struct window_pane *);
	void	(*resize)(struct window_pane *, u_int, u_int);
	void	(*key)(struct window_pane *, struct session *, int);
	void	(*mouse)(struct window_pane *,
		    struct session *, struct mouse_event *);
	void	(*timer)(struct window_pane *);
};

/* Child window structure. */
struct window_pane {
	struct window	*window;
	struct layout_cell *layout_cell;

	u_int		 sx;
	u_int		 sy;

	u_int		 xoff;
	u_int		 yoff;

	int		 flags;
#define PANE_REDRAW 0x1
#define PANE_FREEZE 0x2

	char		*cmd;
	char		*shell;
	char		*cwd;

	pid_t		 pid;
	char		 tty[TTY_NAME_MAX];

	int		 fd;
	struct bufferevent *event;

	struct input_ctx ictx;

	int		 pipe_fd;
	struct bufferevent *pipe_event;
	size_t		 pipe_off;

	struct screen	*screen;
	struct screen	 base;

	/* Saved in alternative screen mode. */
	u_int		 saved_cx;
	u_int		 saved_cy;
	struct grid	*saved_grid;
	struct grid_cell saved_cell;

	const struct window_mode *mode;
	void		*modedata;

	TAILQ_ENTRY(window_pane) entry;
};
TAILQ_HEAD(window_panes, window_pane);

/* Window structure. */
struct window {
	char		*name;
	struct event	 name_timer;

	struct window_pane *active;
	struct window_panes panes;

	int		 lastlayout;
	struct layout_cell *layout_root;

	u_int		 sx;
	u_int		 sy;

	int		 flags;
#define WINDOW_BELL 0x1
#define WINDOW_HIDDEN 0x2
#define WINDOW_ACTIVITY 0x4
#define WINDOW_CONTENT 0x8
#define WINDOW_REDRAW 0x10

	struct options	 options;

	u_int		 references;
};
ARRAY_DECL(windows, struct window *);

/* Entry on local window list. */
struct winlink {
	int		 idx;
	struct window	*window;

	size_t		 status_width;
	struct grid_cell status_cell;
	char		*status_text;

	RB_ENTRY(winlink) entry;
	TAILQ_ENTRY(winlink) sentry;
};
RB_HEAD(winlinks, winlink);
TAILQ_HEAD(winlink_stack, winlink);

/* Layout direction. */
enum layout_type {
	LAYOUT_LEFTRIGHT,
	LAYOUT_TOPBOTTOM,
	LAYOUT_WINDOWPANE
};

/* Layout cells queue. */
TAILQ_HEAD(layout_cells, layout_cell);

/* Layout cell. */
struct layout_cell {
	enum layout_type type;

	struct layout_cell *parent;

	u_int		 sx;
	u_int		 sy;

	u_int		 xoff;
	u_int		 yoff;

	struct window_pane *wp;
	struct layout_cells cells;

	TAILQ_ENTRY(layout_cell) entry;
};

/* Paste buffer. */
struct paste_buffer {
	char		*data;
	size_t		 size;
};
ARRAY_DECL(paste_stack, struct paste_buffer *);

/* Environment variable. */
struct environ_entry {
	char		*name;
	char		*value;

	RB_ENTRY(environ_entry) entry;
};
RB_HEAD(environ, environ_entry);

/* Client session. */
struct session_alert {
	struct winlink	*wl;
	int		 type;

	SLIST_ENTRY(session_alert) entry;
};

struct session_group {
	TAILQ_HEAD(, session) sessions;

	TAILQ_ENTRY(session_group) entry;
};
TAILQ_HEAD(session_groups, session_group);

struct session {
	char		*name;

	struct timeval	 creation_time;
	struct timeval	 activity_time;

	u_int		 sx;
	u_int		 sy;

	struct winlink	*curw;
	struct winlink_stack lastw;
	struct winlinks	 windows;

	struct options	 options;

	struct paste_stack buffers;

	SLIST_HEAD(, session_alert) alerts;

#define SESSION_UNATTACHED 0x1	/* not attached to any clients */
#define SESSION_DEAD 0x2
	int		 flags;

	struct termios	*tio;

	struct environ	 environ;

	int		 references;

	TAILQ_ENTRY(session) gentry;
};
ARRAY_DECL(sessions, struct session *);

/* TTY information. */
struct tty_key {
	char		 ch;
	int		 key;

	struct tty_key	*left;
	struct tty_key	*right;

	struct tty_key	*next;
};

struct tty_term {
	char		*name;
	u_int		 references;

	struct tty_code	 codes[NTTYCODE];

#define TERM_256COLOURS 0x1
#define TERM_88COLOURS 0x2
#define TERM_EARLYWRAP 0x4
	int		 flags;

	SLIST_ENTRY(tty_term) entry;
};
SLIST_HEAD(tty_terms, tty_term);

struct tty {
	char		*path;

	u_int		 sx;
	u_int		 sy;

	u_int		 cx;
	u_int		 cy;

	int		 mode;

	u_int		 rlower;
	u_int		 rupper;

	char		*termname;
	struct tty_term	*term;

	int		 fd;
	struct bufferevent *event;

	int		 log_fd;

	struct termios	 tio;

	struct grid_cell cell;

	u_char		 acs[UCHAR_MAX + 1];

#define TTY_NOCURSOR 0x1
#define TTY_FREEZE 0x2
#define TTY_ESCAPE 0x4
#define TTY_UTF8 0x8
#define TTY_STARTED 0x10
#define TTY_OPENED 0x20
	int		 flags;

	int		 term_flags;

	void		 (*key_callback)(int, struct mouse_event *, void *);
	void		*key_data;
	struct event	 key_timer;
	struct tty_key	*key_tree;
};

/* TTY command context and function pointer. */
struct tty_ctx {
	struct window_pane *wp;

	const struct grid_cell *cell;
	const struct grid_utf8 *utf8;

	u_int		 num;
	void		*ptr;

	/*
	 * Cursor and region position before the screen was updated - this is
	 * where the command should be applied; the values in the screen have
	 * already been updated.
	 */
	u_int		 ocx;
	u_int		 ocy;

	u_int		 orupper;
	u_int		 orlower;

	/* Saved last cell on line. */
	struct grid_cell last_cell;
	struct grid_utf8 last_utf8;
	u_int		 last_width;
};

/* Mouse input. */
struct mouse_event {
	u_char	b;
	u_char	x;
	u_char	y;
};

/* Saved message entry. */
struct message_entry {
	char   *msg;
	time_t	msg_time;
};

/* Client connection. */
struct client {
	struct imsgbuf	 ibuf;
	struct event	 event;

	struct timeval	 creation_time;
	struct timeval	 activity_time;

	struct environ	 environ;

	char		*title;
	char		*cwd;

	struct tty	 tty;
	struct event	 repeat_timer;

	struct timeval	 status_timer;
	struct jobs	 status_jobs;
	struct screen	 status;

#define CLIENT_TERMINAL 0x1
#define CLIENT_PREFIX 0x2
/* 0x4 unused */
#define CLIENT_REDRAW 0x8
#define CLIENT_STATUS 0x10
#define CLIENT_REPEAT 0x20	/* allow command to repeat within repeat time */
#define CLIENT_SUSPENDED 0x40
#define CLIENT_BAD 0x80
#define CLIENT_IDENTIFY 0x100
#define CLIENT_DEAD 0x200
#define CLIENT_BORDERS 0x400
#define CLIENT_READONLY 0x800
	int		 flags;

	struct event	 identify_timer;

	char		*message_string;
	struct event	 message_timer;
	ARRAY_DECL(, struct message_entry) message_log;

	char		*prompt_string;
	char		*prompt_buffer;
	size_t		 prompt_index;
	int		 (*prompt_callbackfn)(void *, const char *);
	void		 (*prompt_freefn)(void *);
	void		*prompt_data;

#define PROMPT_SINGLE 0x1
	int		 prompt_flags;

	u_int		 prompt_hindex;
	ARRAY_DECL(, char *) prompt_hdata;

	struct mode_key_data prompt_mdata;

	struct session	*session;

	int		 references;
};
ARRAY_DECL(clients, struct client *);

/* Key/command line command. */
struct cmd_ctx {
	/*
	 * curclient is the client where this command was executed if inside
	 * tmux. This is NULL if the command came from the command-line.
	 *
	 * cmdclient is the client which sent the MSG_COMMAND to the server, if
	 * any. This is NULL unless the command came from the command-line.
	 *
	 * cmdclient and curclient may both be NULL if the command is in the
	 * configuration file.
	 */
	struct client  *curclient;
	struct client  *cmdclient;

	struct msg_command_data	*msgdata;

	/* gcc2 doesn't understand attributes on function pointers... */
#if defined(__GNUC__) && __GNUC__ >= 3
	void printflike2 (*print)(struct cmd_ctx *, const char *, ...);
	void printflike2 (*info)(struct cmd_ctx *, const char *, ...);
	void printflike2 (*error)(struct cmd_ctx *, const char *, ...);
#else
	void (*print)(struct cmd_ctx *, const char *, ...);
	void (*info)(struct cmd_ctx *, const char *, ...);
	void (*error)(struct cmd_ctx *, const char *, ...);
#endif
};

struct cmd {
	const struct cmd_entry *entry;
	void		*data;

	TAILQ_ENTRY(cmd) qentry;
};
TAILQ_HEAD(cmd_list, cmd);

struct cmd_entry {
	const char	*name;
	const char	*alias;
	const char	*usage;

#define CMD_STARTSERVER 0x1
#define CMD_CANTNEST 0x2
#define CMD_SENDENVIRON 0x4
#define CMD_ARG1 0x8
#define CMD_ARG01 0x10
#define CMD_ARG2 0x20
#define CMD_ARG12 0x40
#define CMD_READONLY 0x80
	int		 flags;

	const char	*chflags;

	void		 (*init)(struct cmd *, int);
	int		 (*parse)(struct cmd *, int, char **, char **);
	int		 (*exec)(struct cmd *, struct cmd_ctx *);
	void		 (*free)(struct cmd *);
	size_t		 (*print)(struct cmd *, char *, size_t);
};

/* Generic command data. */
struct cmd_target_data {
	uint64_t chflags;

	char	*target;

	char	*arg;
	char	*arg2;
};

struct cmd_srcdst_data {
	uint64_t chflags;

	char	*src;
	char	*dst;

	char	*arg;
	char	*arg2;
};

struct cmd_buffer_data {
	uint64_t chflags;

	char	*target;
	int	 buffer;

	char	*arg;
	char	*arg2;
};

/* Key binding. */
struct key_binding {
	int		 key;
	struct cmd_list	*cmdlist;
	int		 can_repeat;

	SPLAY_ENTRY(key_binding) entry;
};
SPLAY_HEAD(key_bindings, key_binding);

/* Set/display option data. */
struct set_option_entry {
	const char	*name;
	enum {
		SET_OPTION_STRING,
		SET_OPTION_NUMBER,
		SET_OPTION_KEYS,
		SET_OPTION_COLOUR,
		SET_OPTION_ATTRIBUTES,
		SET_OPTION_FLAG,
		SET_OPTION_CHOICE
	} type;

	u_int		 minimum;
	u_int		 maximum;

	const char     **choices;
};

/* List of configuration causes. */
ARRAY_DECL(causelist, char *);

/* tmux.c */
extern struct options global_options;
extern struct options global_s_options;
extern struct options global_w_options;
extern struct environ global_environ;
extern struct event_base *ev_base;
extern char	*cfg_file;
extern int	 debug_level;
extern int	 be_quiet;
extern time_t	 start_time;
extern char	*socket_path;
extern int	 login_shell;
void		 logfile(const char *);
const char	*getshell(void);
int		 checkshell(const char *);
int		 areshell(const char *);

/* cfg.c */
extern int       cfg_finished;
struct causelist cfg_causes;
void printflike2 cfg_add_cause(struct causelist *, const char *, ...);
int		 load_cfg(const char *, struct cmd_ctx *, struct causelist *);

/* mode-key.c */
extern const struct mode_key_table mode_key_tables[];
extern struct mode_key_tree mode_key_tree_vi_edit;
extern struct mode_key_tree mode_key_tree_vi_choice;
extern struct mode_key_tree mode_key_tree_vi_copy;
extern struct mode_key_tree mode_key_tree_emacs_edit;
extern struct mode_key_tree mode_key_tree_emacs_choice;
extern struct mode_key_tree mode_key_tree_emacs_copy;
int	mode_key_cmp(struct mode_key_binding *, struct mode_key_binding *);
SPLAY_PROTOTYPE(mode_key_tree, mode_key_binding, entry, mode_key_cmp);
const char *mode_key_tostring(struct mode_key_cmdstr *r, enum mode_key_cmd);
enum mode_key_cmd mode_key_fromstring(struct mode_key_cmdstr *, const char *);
const struct mode_key_table *mode_key_findtable(const char *);
void	mode_key_init_trees(void);
void	mode_key_init(struct mode_key_data *, struct mode_key_tree *);
enum mode_key_cmd mode_key_lookup(struct mode_key_data *, int);

/* options.c */
int	options_cmp(struct options_entry *, struct options_entry *);
SPLAY_PROTOTYPE(options_tree, options_entry, entry, options_cmp);
void	options_init(struct options *, struct options *);
void	options_free(struct options *);
struct options_entry *options_find1(struct options *, const char *);
struct options_entry *options_find(struct options *, const char *);
void	options_remove(struct options *, const char *);
struct options_entry *printflike3 options_set_string(
	    struct options *, const char *, const char *, ...);
char   *options_get_string(struct options *, const char *);
struct options_entry *options_set_number(
	    struct options *, const char *, long long);
long long options_get_number(struct options *, const char *);
struct options_entry *options_set_data(
	    struct options *, const char *, void *, void (*)(void *));
void   *options_get_data(struct options *, const char *);

/* job.c */
extern struct joblist all_jobs;
int	job_cmp(struct job *, struct job *);
RB_PROTOTYPE(jobs, job, entry, job_cmp);
void	job_tree_init(struct jobs *);
void	job_tree_free(struct jobs *);
struct job *job_get(struct jobs *, const char *);
struct job *job_add(struct jobs *, int, struct client *,
	    const char *, void (*)(struct job *), void (*)(void *), void *);
void	job_remove(struct jobs *, struct job *);
void	job_free(struct job *);
int	job_run(struct job *);
void	job_died(struct job *, int);
void	job_kill(struct job *);

/* environ.c */
int	environ_cmp(struct environ_entry *, struct environ_entry *);
RB_PROTOTYPE(environ, environ_entry, entry, environ_cmp);
void	environ_init(struct environ *);
void	environ_free(struct environ *);
void	environ_copy(struct environ *, struct environ *);
struct environ_entry *environ_find(struct environ *, const char *);
void	environ_set(struct environ *, const char *, const char *);
void	environ_put(struct environ *, const char *);
void	environ_unset(struct environ *, const char *);
void	environ_update(const char *, struct environ *, struct environ *);
void	environ_push(struct environ *);

/* tty.c */
void	tty_raw(struct tty *, const char *);
u_char	tty_get_acs(struct tty *, u_char);
void	tty_attributes(struct tty *, const struct grid_cell *);
void	tty_reset(struct tty *);
void	tty_region_pane(struct tty *, const struct tty_ctx *, u_int, u_int);
void	tty_region(struct tty *, u_int, u_int);
void	tty_cursor_pane(struct tty *, const struct tty_ctx *, u_int, u_int);
void	tty_cursor(struct tty *, u_int, u_int);
void	tty_putcode(struct tty *, enum tty_code_code);
void	tty_putcode1(struct tty *, enum tty_code_code, int);
void	tty_putcode2(struct tty *, enum tty_code_code, int, int);
void	tty_puts(struct tty *, const char *);
void	tty_putc(struct tty *, u_char);
void	tty_pututf8(struct tty *, const struct grid_utf8 *);
void	tty_init(struct tty *, int, char *);
int	tty_resize(struct tty *);
void	tty_start_tty(struct tty *);
void	tty_stop_tty(struct tty *);
void	tty_set_title(struct tty *, const char *);
void	tty_update_mode(struct tty *, int);
void	tty_draw_line(struct tty *, struct screen *, u_int, u_int, u_int);
int	tty_open(struct tty *, const char *, char **);
void	tty_close(struct tty *);
void	tty_free(struct tty *);
void	tty_write(void (*)(
	    struct tty *, const struct tty_ctx *), const struct tty_ctx *);
void	tty_cmd_alignmenttest(struct tty *, const struct tty_ctx *);
void	tty_cmd_cell(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearendofline(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearendofscreen(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearline(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearscreen(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearstartofline(struct tty *, const struct tty_ctx *);
void	tty_cmd_clearstartofscreen(struct tty *, const struct tty_ctx *);
void	tty_cmd_deletecharacter(struct tty *, const struct tty_ctx *);
void	tty_cmd_deleteline(struct tty *, const struct tty_ctx *);
void	tty_cmd_insertcharacter(struct tty *, const struct tty_ctx *);
void	tty_cmd_insertline(struct tty *, const struct tty_ctx *);
void	tty_cmd_linefeed(struct tty *, const struct tty_ctx *);
void	tty_cmd_utf8character(struct tty *, const struct tty_ctx *);
void	tty_cmd_reverseindex(struct tty *, const struct tty_ctx *);

/* tty-term.c */
extern struct tty_terms tty_terms;
extern struct tty_term_code_entry tty_term_codes[NTTYCODE];
struct tty_term *tty_term_find(char *, int, const char *, char **);
void		 tty_term_free(struct tty_term *);
int		 tty_term_has(struct tty_term *, enum tty_code_code);
const char	*tty_term_string(struct tty_term *, enum tty_code_code);
const char	*tty_term_string1(struct tty_term *, enum tty_code_code, int);
const char	*tty_term_string2(
		     struct tty_term *, enum tty_code_code, int, int);
int		 tty_term_number(struct tty_term *, enum tty_code_code);
int		 tty_term_flag(struct tty_term *, enum tty_code_code);

/* tty-keys.c */
void	tty_keys_init(struct tty *);
void	tty_keys_free(struct tty *);
int	tty_keys_next(struct tty *);

/* paste.c */
void		 paste_init_stack(struct paste_stack *);
void		 paste_free_stack(struct paste_stack *);
struct paste_buffer *paste_walk_stack(struct paste_stack *, uint *);
struct paste_buffer *paste_get_top(struct paste_stack *);
struct paste_buffer *paste_get_index(struct paste_stack *, u_int);
int		 paste_free_top(struct paste_stack *);
int		 paste_free_index(struct paste_stack *, u_int);
void		 paste_add(struct paste_stack *, char *, size_t, u_int);
int		 paste_replace(struct paste_stack *, u_int, char *, size_t);

/* clock.c */
extern const char clock_table[14][5][5];
void		 clock_draw(struct screen_write_ctx *, int, int);

/* cmd-set-option.c */
extern const struct set_option_entry set_option_table[];
extern const struct set_option_entry set_session_option_table[];
extern const struct set_option_entry set_window_option_table[];
const char	*cmd_set_option_print(
		    const struct set_option_entry *, struct options_entry *);

/* cmd.c */
int		 cmd_pack_argv(int, char **, char *, size_t);
int		 cmd_unpack_argv(char *, size_t, int, char ***);
void		 cmd_free_argv(int, char **);
struct cmd	*cmd_parse(int, char **, char **);
int		 cmd_exec(struct cmd *, struct cmd_ctx *);
void		 cmd_free(struct cmd *);
size_t		 cmd_print(struct cmd *, char *, size_t);
struct session	*cmd_current_session(struct cmd_ctx *);
struct client	*cmd_current_client(struct cmd_ctx *);
struct client	*cmd_find_client(struct cmd_ctx *, const char *);
struct session	*cmd_find_session(struct cmd_ctx *, const char *);
struct winlink	*cmd_find_window(
		     struct cmd_ctx *, const char *, struct session **);
int		 cmd_find_index(
		     struct cmd_ctx *, const char *, struct session **);
struct winlink	*cmd_find_pane(struct cmd_ctx *,
		     const char *, struct session **, struct window_pane **);
char		*cmd_template_replace(char *, const char *, int);
extern const struct cmd_entry *cmd_table[];
extern const struct cmd_entry cmd_attach_session_entry;
extern const struct cmd_entry cmd_bind_key_entry;
extern const struct cmd_entry cmd_break_pane_entry;
extern const struct cmd_entry cmd_capture_pane_entry;
extern const struct cmd_entry cmd_choose_client_entry;
extern const struct cmd_entry cmd_choose_session_entry;
extern const struct cmd_entry cmd_choose_window_entry;
extern const struct cmd_entry cmd_clear_history_entry;
extern const struct cmd_entry cmd_clock_mode_entry;
extern const struct cmd_entry cmd_command_prompt_entry;
extern const struct cmd_entry cmd_confirm_before_entry;
extern const struct cmd_entry cmd_copy_buffer_entry;
extern const struct cmd_entry cmd_copy_mode_entry;
extern const struct cmd_entry cmd_delete_buffer_entry;
extern const struct cmd_entry cmd_detach_client_entry;
extern const struct cmd_entry cmd_display_message_entry;
extern const struct cmd_entry cmd_display_panes_entry;
extern const struct cmd_entry cmd_down_pane_entry;
extern const struct cmd_entry cmd_find_window_entry;
extern const struct cmd_entry cmd_has_session_entry;
extern const struct cmd_entry cmd_if_shell_entry;
extern const struct cmd_entry cmd_join_pane_entry;
extern const struct cmd_entry cmd_kill_pane_entry;
extern const struct cmd_entry cmd_kill_server_entry;
extern const struct cmd_entry cmd_kill_session_entry;
extern const struct cmd_entry cmd_kill_window_entry;
extern const struct cmd_entry cmd_last_window_entry;
extern const struct cmd_entry cmd_link_window_entry;
extern const struct cmd_entry cmd_list_buffers_entry;
extern const struct cmd_entry cmd_list_clients_entry;
extern const struct cmd_entry cmd_list_commands_entry;
extern const struct cmd_entry cmd_list_keys_entry;
extern const struct cmd_entry cmd_list_panes_entry;
extern const struct cmd_entry cmd_list_sessions_entry;
extern const struct cmd_entry cmd_list_windows_entry;
extern const struct cmd_entry cmd_load_buffer_entry;
extern const struct cmd_entry cmd_lock_client_entry;
extern const struct cmd_entry cmd_lock_server_entry;
extern const struct cmd_entry cmd_lock_session_entry;
extern const struct cmd_entry cmd_move_window_entry;
extern const struct cmd_entry cmd_new_session_entry;
extern const struct cmd_entry cmd_new_window_entry;
extern const struct cmd_entry cmd_next_layout_entry;
extern const struct cmd_entry cmd_next_window_entry;
extern const struct cmd_entry cmd_paste_buffer_entry;
extern const struct cmd_entry cmd_pipe_pane_entry;
extern const struct cmd_entry cmd_previous_layout_entry;
extern const struct cmd_entry cmd_previous_window_entry;
extern const struct cmd_entry cmd_refresh_client_entry;
extern const struct cmd_entry cmd_rename_session_entry;
extern const struct cmd_entry cmd_rename_window_entry;
extern const struct cmd_entry cmd_resize_pane_entry;
extern const struct cmd_entry cmd_respawn_window_entry;
extern const struct cmd_entry cmd_rotate_window_entry;
extern const struct cmd_entry cmd_run_shell_entry;
extern const struct cmd_entry cmd_save_buffer_entry;
extern const struct cmd_entry cmd_select_layout_entry;
extern const struct cmd_entry cmd_select_pane_entry;
extern const struct cmd_entry cmd_select_window_entry;
extern const struct cmd_entry cmd_send_keys_entry;
extern const struct cmd_entry cmd_send_prefix_entry;
extern const struct cmd_entry cmd_server_info_entry;
extern const struct cmd_entry cmd_set_buffer_entry;
extern const struct cmd_entry cmd_set_environment_entry;
extern const struct cmd_entry cmd_set_option_entry;
extern const struct cmd_entry cmd_set_window_option_entry;
extern const struct cmd_entry cmd_show_buffer_entry;
extern const struct cmd_entry cmd_show_environment_entry;
extern const struct cmd_entry cmd_show_messages_entry;
extern const struct cmd_entry cmd_show_options_entry;
extern const struct cmd_entry cmd_show_window_options_entry;
extern const struct cmd_entry cmd_source_file_entry;
extern const struct cmd_entry cmd_split_window_entry;
extern const struct cmd_entry cmd_start_server_entry;
extern const struct cmd_entry cmd_suspend_client_entry;
extern const struct cmd_entry cmd_swap_pane_entry;
extern const struct cmd_entry cmd_swap_window_entry;
extern const struct cmd_entry cmd_switch_client_entry;
extern const struct cmd_entry cmd_unbind_key_entry;
extern const struct cmd_entry cmd_unlink_window_entry;
extern const struct cmd_entry cmd_up_pane_entry;

/* cmd-list.c */
struct cmd_list	*cmd_list_parse(int, char **, char **);
int		 cmd_list_exec(struct cmd_list *, struct cmd_ctx *);
void		 cmd_list_free(struct cmd_list *);
size_t		 cmd_list_print(struct cmd_list *, char *, size_t);

/* cmd-string.c */
int	cmd_string_parse(const char *, struct cmd_list **, char **);

/* cmd-generic.c */
size_t	cmd_prarg(char *, size_t, const char *, char *);
int	cmd_check_flag(uint64_t, int);
void	cmd_set_flag(uint64_t *, int);
#define CMD_TARGET_PANE_USAGE "[-t target-pane]"
#define CMD_TARGET_WINDOW_USAGE "[-t target-window]"
#define CMD_TARGET_SESSION_USAGE "[-t target-session]"
#define CMD_TARGET_CLIENT_USAGE "[-t target-client]"
void	cmd_target_init(struct cmd *, int);
int	cmd_target_parse(struct cmd *, int, char **, char **);
void	cmd_target_free(struct cmd *);
size_t	cmd_target_print(struct cmd *, char *, size_t);
#define CMD_SRCDST_PANE_USAGE "[-s src-pane] [-t dst-pane]"
#define CMD_SRCDST_WINDOW_USAGE "[-s src-window] [-t dst-window]"
#define CMD_SRCDST_SESSION_USAGE "[-s src-session] [-t dst-session]"
#define CMD_SRCDST_CLIENT_USAGE "[-s src-client] [-t dst-client]"
void	cmd_srcdst_init(struct cmd *, int);
int	cmd_srcdst_parse(struct cmd *, int, char **, char **);
void	cmd_srcdst_free(struct cmd *);
size_t	cmd_srcdst_print(struct cmd *, char *, size_t);
#define CMD_BUFFER_PANE_USAGE "[-b buffer-index] [-t target-pane]"
#define CMD_BUFFER_WINDOW_USAGE "[-b buffer-index] [-t target-window]"
#define CMD_BUFFER_SESSION_USAGE "[-b buffer-index] [-t target-session]"
#define CMD_BUFFER_CLIENT_USAGE "[-b buffer-index] [-t target-client]"
void	cmd_buffer_init(struct cmd *, int);
int	cmd_buffer_parse(struct cmd *, int, char **, char **);
void	cmd_buffer_free(struct cmd *);
size_t	cmd_buffer_print(struct cmd *, char *, size_t);

/* client.c */
struct imsgbuf *client_init(char *, int, int);
__dead void	client_main(void);

/* key-bindings.c */
extern struct key_bindings key_bindings;
int	 key_bindings_cmp(struct key_binding *, struct key_binding *);
SPLAY_PROTOTYPE(key_bindings, key_binding, entry, key_bindings_cmp);
struct key_binding *key_bindings_lookup(int);
void	 key_bindings_add(int, int, struct cmd_list *);
void	 key_bindings_remove(int);
void	 key_bindings_clean(void);
void	 key_bindings_init(void);
void	 key_bindings_dispatch(struct key_binding *, struct client *);
void printflike2 key_bindings_error(struct cmd_ctx *, const char *, ...);
void printflike2 key_bindings_print(struct cmd_ctx *, const char *, ...);
void printflike2 key_bindings_info(struct cmd_ctx *, const char *, ...);

/* key-string.c */
int	 key_string_lookup_string(const char *);
const char *key_string_lookup_key(int);

/* server.c */
extern struct clients clients;
extern struct clients dead_clients;
int	 server_start(char *);
void	 server_update_socket(void);

/* server-client.c */
void	 server_client_create(int);
void	 server_client_lost(struct client *);
void	 server_client_callback(int, short, void *);
void	 server_client_status_timer(void);
void	 server_client_loop(void);

/* server-window.c */
void	 server_window_loop(void);

/* server-fn.c */
void	 server_fill_environ(struct session *, struct environ *);
void	 server_write_client(
	     struct client *, enum msgtype, const void *, size_t);
void	 server_write_session(
	     struct session *, enum msgtype, const void *, size_t);
void	 server_redraw_client(struct client *);
void	 server_status_client(struct client *);
void	 server_redraw_session(struct session *);
void	 server_redraw_session_group(struct session *);
void	 server_status_session(struct session *);
void	 server_status_session_group(struct session *);
void	 server_redraw_window(struct window *);
void	 server_redraw_window_borders(struct window *);
void	 server_status_window(struct window *);
void	 server_lock(void);
void	 server_lock_session(struct session *);
void	 server_lock_client(struct client *);
int	 server_unlock(const char *);
void	 server_kill_window(struct window *);
int	 server_link_window(struct session *,
	     struct winlink *, struct session *, int, int, int, char **);
void	 server_unlink_window(struct session *, struct winlink *);
void	 server_destroy_pane(struct window_pane *);
void	 server_destroy_session_group(struct session *);
void	 server_destroy_session(struct session *);
void	 server_set_identify(struct client *);
void	 server_clear_identify(struct client *);
void	 server_update_event(struct client *);

/* status.c */
int	 status_redraw(struct client *);
char	*status_replace(
	     struct client *, struct winlink *, const char *, time_t, int);
void printflike2 status_message_set(struct client *, const char *, ...);
void	 status_message_clear(struct client *);
int	 status_message_redraw(struct client *);
void	 status_prompt_set(struct client *, const char *,
	     int (*)(void *, const char *), void (*)(void *), void *, int);
void	 status_prompt_clear(struct client *);
int	 status_prompt_redraw(struct client *);
void	 status_prompt_key(struct client *, int);
void	 status_prompt_update(struct client *, const char *);

/* resize.c */
void	 recalculate_sizes(void);

/* input.c */
void	 input_init(struct window_pane *);
void	 input_free(struct window_pane *);
void	 input_parse(struct window_pane *);

/* input-key.c */
void	 input_key(struct window_pane *, int);
void	 input_mouse(struct window_pane *, struct mouse_event *);

/* xterm-keys.c */
char	*xterm_keys_lookup(int);
int	 xterm_keys_find(const char *, size_t, size_t *, int *);

/* colour.c */
void	 colour_set_fg(struct grid_cell *, int);
void	 colour_set_bg(struct grid_cell *, int);
const char *colour_tostring(int);
int	 colour_fromstring(const char *);
u_char	 colour_256to16(u_char);
u_char	 colour_256to88(u_char);

/* attributes.c */
const char *attributes_tostring(u_char);
int	 attributes_fromstring(const char *);

/* grid.c */
extern const struct grid_cell grid_default_cell;
struct grid *grid_create(u_int, u_int, u_int);
void	 grid_destroy(struct grid *);
int	 grid_compare(struct grid *, struct grid *);
void	 grid_collect_history(struct grid *);
void	 grid_scroll_history(struct grid *);
void	 grid_scroll_history_region(struct grid *, u_int, u_int);
void	 grid_expand_line(struct grid *, u_int, u_int);
void	 grid_expand_line_utf8(struct grid *, u_int, u_int);
const struct grid_cell *grid_peek_cell(struct grid *, u_int, u_int);
struct grid_cell *grid_get_cell(struct grid *, u_int, u_int);
void	 grid_set_cell(struct grid *, u_int, u_int, const struct grid_cell *);
const struct grid_utf8 *grid_peek_utf8(struct grid *, u_int, u_int);
struct grid_utf8 *grid_get_utf8(struct grid *, u_int, u_int);
void	 grid_set_utf8(struct grid *, u_int, u_int, const struct grid_utf8 *);
void	 grid_clear(struct grid *, u_int, u_int, u_int, u_int);
void	 grid_clear_lines(struct grid *, u_int, u_int);
void	 grid_move_lines(struct grid *, u_int, u_int, u_int);
void	 grid_move_cells(struct grid *, u_int, u_int, u_int, u_int);
char	*grid_string_cells(struct grid *, u_int, u_int, u_int);
void	 grid_duplicate_lines(
	     struct grid *, u_int, struct grid *, u_int, u_int);

/* grid-utf8.c */
size_t	 grid_utf8_size(const struct grid_utf8 *);
size_t	 grid_utf8_copy(const struct grid_utf8 *, char *, size_t);
void	 grid_utf8_set(struct grid_utf8 *, const struct utf8_data *);
int	 grid_utf8_append(struct grid_utf8 *, const struct utf8_data *);
int	 grid_utf8_compare(const struct grid_utf8 *, const struct grid_utf8 *);

/* grid-view.c */
const struct grid_cell *grid_view_peek_cell(struct grid *, u_int, u_int);
struct grid_cell *grid_view_get_cell(struct grid *, u_int, u_int);
void	 grid_view_set_cell(
	     struct grid *, u_int, u_int, const struct grid_cell *);
const struct grid_utf8 *grid_view_peek_utf8(struct grid *, u_int, u_int);
struct grid_utf8 *grid_view_get_utf8(struct grid *, u_int, u_int);
void	 grid_view_set_utf8(
	     struct grid *, u_int, u_int, const struct grid_utf8 *);
void	 grid_view_clear(struct grid *, u_int, u_int, u_int, u_int);
void	 grid_view_scroll_region_up(struct grid *, u_int, u_int);
void	 grid_view_scroll_region_down(struct grid *, u_int, u_int);
void	 grid_view_insert_lines(struct grid *, u_int, u_int);
void	 grid_view_insert_lines_region(struct grid *, u_int, u_int, u_int);
void	 grid_view_delete_lines(struct grid *, u_int, u_int);
void	 grid_view_delete_lines_region(struct grid *, u_int, u_int, u_int);
void	 grid_view_insert_cells(struct grid *, u_int, u_int, u_int);
void	 grid_view_delete_cells(struct grid *, u_int, u_int, u_int);
char	*grid_view_string_cells(struct grid *, u_int, u_int, u_int);

/* screen-write.c */
void	 screen_write_start(
	     struct screen_write_ctx *, struct window_pane *, struct screen *);
void	 screen_write_stop(struct screen_write_ctx *);
size_t printflike2 screen_write_cstrlen(int, const char *, ...);
void printflike5 screen_write_cnputs(struct screen_write_ctx *,
	     ssize_t, struct grid_cell *, int, const char *, ...);
size_t printflike2 screen_write_strlen(int, const char *, ...);
void printflike3 screen_write_puts(struct screen_write_ctx *,
	     struct grid_cell *, const char *, ...);
void printflike5 screen_write_nputs(struct screen_write_ctx *,
	     ssize_t, struct grid_cell *, int, const char *, ...);
void	 screen_write_vnputs(struct screen_write_ctx *,
	     ssize_t, struct grid_cell *, int, const char *, va_list);
void	 screen_write_parsestyle(
	     struct grid_cell *, struct grid_cell *, const char *);
void	 screen_write_putc(
	     struct screen_write_ctx *, struct grid_cell *, u_char);
void	 screen_write_copy(struct screen_write_ctx *,
	     struct screen *, u_int, u_int, u_int, u_int);
void	 screen_write_backspace(struct screen_write_ctx *);
void	 screen_write_cursorup(struct screen_write_ctx *, u_int);
void	 screen_write_cursordown(struct screen_write_ctx *, u_int);
void	 screen_write_cursorright(struct screen_write_ctx *, u_int);
void	 screen_write_cursorleft(struct screen_write_ctx *, u_int);
void	 screen_write_alignmenttest(struct screen_write_ctx *);
void	 screen_write_insertcharacter(struct screen_write_ctx *, u_int);
void	 screen_write_deletecharacter(struct screen_write_ctx *, u_int);
void	 screen_write_insertline(struct screen_write_ctx *, u_int);
void	 screen_write_deleteline(struct screen_write_ctx *, u_int);
void	 screen_write_clearline(struct screen_write_ctx *);
void	 screen_write_clearendofline(struct screen_write_ctx *);
void	 screen_write_clearstartofline(struct screen_write_ctx *);
void	 screen_write_cursormove(struct screen_write_ctx *, u_int, u_int);
void	 screen_write_cursormode(struct screen_write_ctx *, int);
void	 screen_write_reverseindex(struct screen_write_ctx *);
void	 screen_write_scrollregion(struct screen_write_ctx *, u_int, u_int);
void	 screen_write_insertmode(struct screen_write_ctx *, int);
void	 screen_write_mousemode(struct screen_write_ctx *, int);
void	 screen_write_linefeed(struct screen_write_ctx *, int);
void	 screen_write_linefeedscreen(struct screen_write_ctx *, int);
void	 screen_write_carriagereturn(struct screen_write_ctx *);
void	 screen_write_kcursormode(struct screen_write_ctx *, int);
void	 screen_write_kkeypadmode(struct screen_write_ctx *, int);
void	 screen_write_clearendofscreen(struct screen_write_ctx *);
void	 screen_write_clearstartofscreen(struct screen_write_ctx *);
void	 screen_write_clearscreen(struct screen_write_ctx *);
void	 screen_write_cell(struct screen_write_ctx *,
	     const struct grid_cell *, const struct utf8_data *);

/* screen-redraw.c */
void	 screen_redraw_screen(struct client *, int, int);
void	 screen_redraw_pane(struct client *, struct window_pane *);

/* screen.c */
void	 screen_init(struct screen *, u_int, u_int, u_int);
void	 screen_reinit(struct screen *);
void	 screen_free(struct screen *);
void	 screen_reset_tabs(struct screen *);
void	 screen_set_title(struct screen *, const char *);
void	 screen_resize(struct screen *, u_int, u_int);
void	 screen_set_selection(struct screen *,
	     u_int, u_int, u_int, u_int, u_int, struct grid_cell *);
void	 screen_clear_selection(struct screen *);
int	 screen_check_selection(struct screen *, u_int, u_int);

/* window.c */
extern struct windows windows;
int		 window_cmp(struct window *, struct window *);
int		 winlink_cmp(struct winlink *, struct winlink *);
RB_PROTOTYPE(windows, window, entry, window_cmp);
RB_PROTOTYPE(winlinks, winlink, entry, winlink_cmp);
struct winlink	*winlink_find_by_index(struct winlinks *, int);
struct winlink	*winlink_find_by_window(struct winlinks *, struct window *);
int		 winlink_next_index(struct winlinks *, int);
u_int		 winlink_count(struct winlinks *);
struct winlink	*winlink_add(struct winlinks *, struct window *, int);
void		 winlink_remove(struct winlinks *, struct winlink *);
struct winlink	*winlink_next(struct winlink *);
struct winlink	*winlink_previous(struct winlink *);
void		 winlink_stack_push(struct winlink_stack *, struct winlink *);
void		 winlink_stack_remove(struct winlink_stack *, struct winlink *);
int		 window_index(struct window *, u_int *);
struct window	*window_create1(u_int, u_int);
struct window	*window_create(const char *, const char *, const char *,
		     const char *, struct environ *, struct termios *,
		     u_int, u_int, u_int, char **);
void		 window_destroy(struct window *);
void		 window_set_active_at(struct window *, u_int, u_int);
void		 window_set_active_pane(struct window *, struct window_pane *);
struct window_pane *window_add_pane(struct window *, u_int);
void		 window_resize(struct window *, u_int, u_int);
void		 window_remove_pane(struct window *, struct window_pane *);
struct window_pane *window_pane_at_index(struct window *, u_int);
u_int		 window_pane_index(struct window *, struct window_pane *);
u_int		 window_count_panes(struct window *);
void		 window_destroy_panes(struct window *);
struct window_pane *window_pane_create(struct window *, u_int, u_int, u_int);
void		 window_pane_destroy(struct window_pane *);
int		 window_pane_spawn(struct window_pane *, const char *,
		     const char *, const char *, struct environ *,
		     struct termios *, char **);
void		 window_pane_resize(struct window_pane *, u_int, u_int);
void		 window_pane_alternate_on(
		     struct window_pane *, struct grid_cell *);
void		 window_pane_alternate_off(
		     struct window_pane *, struct grid_cell *);
int		 window_pane_set_mode(
		     struct window_pane *, const struct window_mode *);
void		 window_pane_reset_mode(struct window_pane *);
void		 window_pane_key(struct window_pane *, struct session *, int);
void		 window_pane_mouse(struct window_pane *,
		     struct session *, struct mouse_event *);
int		 window_pane_visible(struct window_pane *);
char		*window_pane_search(
		     struct window_pane *, const char *, u_int *);
struct window_pane *window_pane_find_up(struct window_pane *);
struct window_pane *window_pane_find_down(struct window_pane *);
struct window_pane *window_pane_find_left(struct window_pane *);
struct window_pane *window_pane_find_right(struct window_pane *);

/* layout.c */
struct layout_cell *layout_create_cell(struct layout_cell *);
void		 layout_free_cell(struct layout_cell *);
void		 layout_print_cell(struct layout_cell *, const char *, u_int);
void		 layout_set_size(
		     struct layout_cell *, u_int, u_int, u_int, u_int);
void		 layout_make_leaf(
		     struct layout_cell *, struct window_pane *);
void		 layout_make_node(struct layout_cell *, enum layout_type);
void		 layout_fix_offsets(struct layout_cell *);
void		 layout_fix_panes(struct window *, u_int, u_int);
u_int		 layout_resize_check(struct layout_cell *, enum layout_type);
void		 layout_resize_adjust(
		     struct layout_cell *, enum layout_type, int);
void		 layout_init(struct window *);
void		 layout_free(struct window *);
void		 layout_resize(struct window *, u_int, u_int);
void		 layout_resize_pane(
		     struct window_pane *, enum layout_type, int);
void		 layout_assign_pane(struct layout_cell *, struct window_pane *);
struct layout_cell *layout_split_pane(
		     struct window_pane *, enum layout_type, int);
void		 layout_close_pane(struct window_pane *);

/* layout-set.c */
const char	*layout_set_name(u_int);
int		 layout_set_lookup(const char *);
u_int		 layout_set_select(struct window *, u_int);
u_int		 layout_set_next(struct window *);
u_int		 layout_set_previous(struct window *);
void		 layout_set_active_changed(struct window *);

/* layout-string.c */
struct layout_cell *layout_find_string(struct window *, const char *);

/* window-clock.c */
extern const struct window_mode window_clock_mode;

/* window-copy.c */
extern const struct window_mode window_copy_mode;
void		 window_copy_init_from_pane(struct window_pane *);
void		 window_copy_init_for_output(struct window_pane *);
void		 window_copy_add(struct window_pane *, const char *, ...);
void		 window_copy_vadd(struct window_pane *, const char *, va_list);
void		 window_copy_pageup(struct window_pane *);

/* window-choose.c */
extern const struct window_mode window_choose_mode;
void		 window_choose_vadd(
		     struct window_pane *, int, const char *, va_list);
void printflike3 window_choose_add(
		     struct window_pane *, int, const char *, ...);
void		 window_choose_ready(struct window_pane *,
		     u_int, void (*)(void *, int), void (*)(void *), void *);

/* names.c */
void		 queue_window_name(struct window *);
char		*default_window_name(struct window *);

/* signal.c */
void set_signals(void(*handler)(int, short, unused void *));
void clear_signals(void);

/* session.c */
extern struct sessions sessions;
extern struct sessions dead_sessions;
extern struct session_groups session_groups;
void	 session_alert_add(struct session *, struct window *, int);
void	 session_alert_cancel(struct session *, struct winlink *);
int	 session_alert_has(struct session *, struct winlink *, int);
int	 session_alert_has_window(struct session *, struct window *, int);
struct session	*session_find(const char *);
struct session	*session_create(const char *, const char *, const char *,
		     struct environ *, struct termios *, int, u_int, u_int,
		     char **);
void		 session_destroy(struct session *);
int		 session_index(struct session *, u_int *);
struct winlink	*session_new(struct session *,
		     const char *, const char *, const char *, int, char **);
struct winlink	*session_attach(
		     struct session *, struct window *, int, char **);
int		 session_detach(struct session *, struct winlink *);
int		 session_has(struct session *, struct window *);
int		 session_next(struct session *, int);
int		 session_previous(struct session *, int);
int		 session_select(struct session *, int);
int		 session_last(struct session *);
struct session_group *session_group_find(struct session *);
u_int		 session_group_index(struct session_group *);
void		 session_group_add(struct session *, struct session *);
void		 session_group_remove(struct session *);
void		 session_group_synchronize_to(struct session *);
void		 session_group_synchronize_from(struct session *);
void		 session_group_synchronize1(struct session *, struct session *);

/* utf8.c */
void	utf8_build(void);
int	utf8_open(struct utf8_data *, u_char);
int	utf8_append(struct utf8_data *, u_char);

/* procname.c */
char   *get_proc_name(int, char *);

/* log.c */
void		 log_open_tty(int);
void		 log_open_file(int, const char *);
void		 log_close(void);
void printflike1 log_warn(const char *, ...);
void printflike1 log_warnx(const char *, ...);
void printflike1 log_info(const char *, ...);
void printflike1 log_debug(const char *, ...);
void printflike1 log_debug2(const char *, ...);
__dead void printflike1 log_fatal(const char *, ...);
__dead void printflike1 log_fatalx(const char *, ...);

/* xmalloc.c */
char		*xstrdup(const char *);
void		*xcalloc(size_t, size_t);
void		*xmalloc(size_t);
void		*xrealloc(void *, size_t, size_t);
void		 xfree(void *);
int printflike2	 xasprintf(char **, const char *, ...);
int		 xvasprintf(char **, const char *, va_list);
int printflike3	 xsnprintf(char *, size_t, const char *, ...);
int		 xvsnprintf(char *, size_t, const char *, va_list);

#endif /* TMUX_H */